The best option for you is probably to ditch the run-flats and fit regular radials. You can then run a regular spare and you could buy a jack from your local auto accessory store.
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BMW 528i Wheel Size
The BMW 528i has a number of different wheel and tyre options. When it comes to tyres, these range from 245x40 R19 for Sedan in 2017 with a wheel size that spans from 8.5x19 inches.
The price range for the BMW 528i varies based on the trim level you choose. Starting at $31,460 and going to $47,850 for the latest year the model was manufactured. The model range is available in the following body types starting from the engine/transmission specs shown below.
The BMW 528i is available in a number of variants and body types that are powered by PULP fuel type(s). It has an estimated fuel consumption starting from 6.7L/100km for Sedan